The image generated by the node is not previewed and then changed, but the data is returned after the process is finished in the background. This looks like a BUG and looks to be fixed.
I'm not entirely sure what you mean here. The fetch remote node always waits for the other one to finish. Do you mean that it keeps running on the other one when you cancel the workflow?
The image generated by the node is not previewed and then changed, but the data is returned after the process is finished in the background. This looks like a BUG and looks to be fixed.